BY L. RODWAY. 185 
spirally twisted (figs. 23 and 24). In 7. cyanea these lobes 
are reduced in length, are straight and irregular in outline, 
and have usually a papillose development low down on their 
anterior margin. The wing is continued behind the anther 
as a papillose projection (figs. 21 and 22). In the typical 
forms of T. carnea the side lobes are reduced to papillose 
ovate processes, and the posterior portion of the wing is 
further developed into a thick papillose wall behind the 
anther (Fig. 20). Iu the intermediate forms connecting this 
with T. ixioides, the side lobes develop copious penicillate 
adornment, and the posterior lobe correspondingly approaches 
the form found in that species (figs. 17, 18, and 19). In the 
typical form of 7. ixicides the side lobes are linear, projected 
forwards in frout of the anther, and terminate in a copious 
penicillate brush; the posterior lobe is divided into three 
portions, a small erect sub-quadrate process on each side, and 
a very short roughly papillose centre (figs. 1, 2,and3). Every 
intermediate stage between this and the form termed 1. 
aristata may be freely met with (figs. 4 to 7). In T. 
aristata the three portions of the posterior lobe have further 
developed and coalesced, but is usually deeply notched or 
split in the central line. The extent of development is most 
variable, but the margin is thin, and often papillose, and the 
substance not thickened (figs. 8 to 12). In 1. longifolia 
the posterior lobe has developed into a thick fleshy hood, with 
a plain or notched thick margin. This form passes gradually 
from an advanced form of T. aristata (figs. 13 to 16). 
The examination of these forms would lead us to conclude 
that T. ixioides, T. aristata, and T. longifolia are but charac- 
teristic states of a most variable species. J’. carnea is a 
fairly marked species, but the links connecting it with T. 
ixioides still exist. TT. cyanea is near to, but distinct from, 
T. ixioides; and T. venosa, is a fairly well marked species, 
certainly further removed from T. cyanea than that species is 
from ’. ixioides. 
The following is a description of sundry details of the 
plants whose columns are shown in the Plate ITI. 
The sketches are 24 to 3 times natural size. 
Fig. 1.—18 inches high, robust. Leaf thick, broad, ribbed, 
9 inches long. Raceme of 7 flowers. Perianth 
7 lines long, blue and pink, spotted with dark 
blue. 
Fig. 2.—10 inches high, slender. Leaf thick, slender, 5 inches 
long. Raceme of 3 flowers. Perianth 7 lines 
_ long, blue and pink, without spots or stripes. 
Fig. 3.—7 inches high, slender. Jeaf thick, slender, 4 
inches long. Raceme of 2 flowers. Perianth 
4 to 5 lines long, pink, spotted with blue. 
M 
